Chemistry, 17.07.2019 00:00 diego481

Agas in a rigid container at 25°c has a pressure of 0.96 atm. a change in temperature causes the pressure to increase to 1.25 atm. what is the new temperature of the gas? use –44.2°c 32.6°c 115°c 388°c

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Answer from: granta1

Well, one of the most important formulas you will learn in Chemistry(AP or Honors) is PV = nRT, or Pressure*Volume = mole*R*Temperature. It states that the container is rigid, so volume can't change. No molecules are going in or out of the container, so moles can't change. Finally, R is a constant value, so it is always the same. This means that As T increases, P increases at the same rate. Thus you get (P1/T1 = P2/T2) where P1 and T1 is the pressure and temperature for the first container, and P2 and T2 are the pressure and temperature for the container after change. Plugging in values, you should get 0.96/(25 + 273) = 1.25/(T2) (Note that I add 273 because T is in kelvin, and you are given celsius), or T2 = 388k. This 388 - 273 = 115 C

Answer from: rachis

Answer is C) 115'C

Explanation:

i just took the test.

Answer from: Quest

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.

chemical decomposition is opposite of chemical synthesis.

Answer from: Quest

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.

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